Review Request 35857: Added Acknowledge call support to the master and the C++ scheduler library.

[Vinod Kone]

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https://reviews.apache.org/r/35857/
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Review request for mesos, Anand Mazumdar, Ben Mahler, Isabel Jimenez, and Marco 
Massenzio.


Bugs: MESOS-2551
    https://issues.apache.org/jira/browse/MESOS-2551


Repository: mesos


Description
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See summary.


Diffs
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  src/master/master.hpp af83d3e82d2c161b3cc4583e78a8cbbd2f9a4064 
  src/master/master.cpp 0782b543b451921d2240958c7ef612a9e30972df 
  src/scheduler/scheduler.cpp 1efc6fb351e49deaa8f626823592bc9155f5137b 

Diff: https://reviews.apache.org/r/35857/diff/


Testing
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make check

NOTE: Didn't add a new test because an existing test 
(SchedulerTest.TaskRunning) already exercises this code path.


Thanks,

Vinod Kone